Lifting jack



July 15, 1.9246 1,501,155

J. M. WILLS LIFTING JACK Filed March 16 2 2 Sheets-Sheet 1 Ig e9 a MB Eu5'! ii'hl W 24 I 2 32 17 l 25 7 T 27 4; 22 2 6 3% I T I 30 5 N 52 l IINVENTOR J. M. WILLS LIFTING JACK Filed March 16 1922 2 Sheets5heet 3 50a u 5 \\\\\\\\\\x\\ v 5] INVENTOR flames M wills.

BY I A 0 y ATTORNEY Patented July 15, i924.

arias JAEEES M, wmns, OF OTTAWA; ONTARIO, GAHAD A.

LIFTING SACK.

Application filed March 16, 1922. Serial Ho. 544,381.

To all whom it may concern:

Be it known that I, JAMES M. WILLS, a citizen of the Dominion of Canada,residing .atOttawa, in the county of Carleton and Province of Ontario,have invented certain new and useful Improvements in Lifting Jacks, ofwhich the following is a specification.

This invention has relation to certain new and useful improvements in alifting jack which will be self'lubricating and in which will beincluded double acting adjusting means controlled by an operatinghandle.

This invention has for anotherobject the provision of a lifting jack ofthe character stated which will be of simple and comp'arativelyinexpensive construction and in which the lifting screw will have anindependent spiral movement within the lspirally movable sleeve duringthe adjustment of the parts of the device when in engagement with astationary object; the lifting screw moving with the sleeve when theliftin screw is not engaged with a stationary ob ect to prevent rotationof the lifting screw.

The invention has for a further object the provision of a lifting screwof the character stated which will beof compact form as well as highlyeflicient in use and which may be readily and accurately adjusted andoperated.

The invention has. for a still further object the provision of a liftingjack of the character set forth which will be composed of the minimumnumber of arts. and may be readily assembled as well as highly efficientin use. p n

With the foregoing and other objects in view as will be apparent as thedescription proceeds the invention consists-in the novel construction,combination and arrangement of co-opera'ting elements as hereinaftermore specifical y set forth, claimed and shown in theaccompanyingdrawings forming a part of thepresent applicationand in which Figure 1is an elevation of the complete 2is a plan view of the lifting thedirection indicated by the arrows.

Figure 4 is a vertical sectional view substantially on the plane of line44 of Figure 2, looking in the direction indicated by the arrows.

Referring more in'detail to the drawings in which similar referencecharacters designate corresponding parts throughout the several views, 3indicates the body casting having a vertical central opening 4 which isthreaded in its upper portion to receive the exteriorly threaded liftingsleeve 5, as shown clearly in Figure 5. The lower end 6 of the casting 3is reduced and exteriorly threaded to receive the base cap 7 which isalso illustrated in Figure 4. The lifting sleeve 5 is also interiorlythreaded in its upper portion to receive the threadedv lifting screw 8which carries the work receiving member 9 on its upper end. It will beseen that a 1nbricant may be placed in the lower end of the centralopening {l of the body casting 3 to lubricate the lifting sleeve 5 andthe hiting-screw 8 as they are lowered. 'The cutting away of the threadsat the lower ends of the central opening 4 of the body casting 3 and thelower portion of the bore of the lifting sleeve 5 will permit a properlubrication of these parts.

The body casting 3 has a pocket 10 inits upper end opening on the topand the opposite sides of the body casting 3. A. collar '11 extendsupwardly in the center of the pocket 10 around the lifting sleeve Send abearing member 12 seats upon the collar 11. The second bearing member 13is spaced above the member 12 and the bearing balls 14 are locatedbetween the bearing members 12 and 13. A bevel gear 15 seats upon thejectin into its central opening for engagement 1n the longitudina slot'5extendmg on the outer side of the liftin sleeve 5 to cause rotation ofthis sleeve w en the gear 15 is rotated.

As means for operating the bevel gear 15, an operatingbeve positioned inone of the side extensions of the pocket -10. This operatingbevel gear20 is in meshwith the bevel gear 15 to rotate gear 20 is employed and,

the latter. A stem 21 projects from one face of the operating bevel gear20, through a sleeve 22 and the plug 23 is formed on one end of thesleeve 22. This plug is threaded in the side extension of the pocket 10.An adjustable handle bar 24 is provided with an elongated slot 25through which the outer end of the stem 21 may project, the portion 26of the stem 21 receiving the slot 25 being referably squared so thatrotation of the andle bar 24 will cause a similar rotation of the stem21 and the bevel gear 20. Suitable washers 27 may be placed on oppositesides of the slotted central portion of the handle bar 24: and a thumbnut 28 or the like maybe mounted on the threaded outer extremity of thestem 21 to retain the handle bar 24 in adjusted position upon the stem21. Suitable handle members such as hand ips 30 are carried on the pins31 projectmg laterally from the end portion of the handle bar 24. It isevident that the handle bar 24 may be readily moved or adjusted back andforth on the stem 21to move either handle members 31 away from the stem21, as may be desired to increase or decrease the leverage. The oppositeend extension of the pocket 10 may be closed by the threaded block 32forming a removable closure for that end of the pocket as shown in thedrawing.

It is believed the complete construction and operation should now beapparent to parties familiar with this art from the foregoing paragraphstaken in connection with the accompanying drawings, without furtherdetailed description. It may be briefly stated, however, that when theoperating handle (including the handle bar '24 and handle grips 30) isturned in one direction, the lifting sleeve 5 will be caused to rotateso as to work upwardly out of the body casting 3. When the operatinghandle is turned in the reverse direction, however, the lifting sleeve 5is caused to rotate in the reverse direction and travel downwardly inthe body casting 3. The motion is imparted from the handle bar 24 andthe stem 21 and the operating bevel gear 20 mounted thereon to the bevelgear 15 and this readily causes operation of the lifting sleeve 5. Whenthere is a pressure upon the lifting screw 8, this member is preventedfrom rotating and, therefore, moves longitudinally in the lifting sleeve5. When the block 9 on the lifting screw 8 is in engagement with anystationary object or is held against rotation, the lifting sleeve 5 willrotate on the lift.- ing screw 8. The lifti'ngsleeve 5 must at all timesrotate in the threaded opening 4 of the body casting 3 when theoperating bevel gear 15 is rotated and in the same direction with theoperating bevel gear 15. As the lifting sleeve 5 rotates with theoperating bevel gear 15 the lifting sleeve 5 also moves longitudinallythrough this operating bevel gear 15. The slot 5' ends a short? distancefrom the bottom of the sleeve 5, so as to act as a'stop when the sleeveis rotated to the desired limit. It is believed that further detaileddescription is unnecessary. The pocket 10 serves as a reservoir forlubricant and the closure 32 serves to keep the same liquidtight' andprovides for replenishing the lubricant when necessary, and for accessto the ball bearings, etc.

While the preferred embodiment of this invention is shown and described,it is to be understood that minor'changes in the details of constructionand arrangement of parts maybe resorted to within the scope of what isclaimed without departing from the spirit of the invention.

What I claim as new is:

1. In a lifting jack, a body member, an exteriorly-threaded liftingsleeve having threaded engagement therein and interiorly threaded, athreaded lifting screw engaged therein and having independent spiralmovement therein during the adjustment of the parts in operation andmovable with the sleeve when the screw is not engaged with a stationaryobject, means for rotating the lifting sleeve to move the same upwardly,and means embodying an operating bevel ear rotating with said sleeve andthrough w ich said sleeve moves.

2. In a lifting jack, a body member, an exteriorly-threaded liftingsleeve having threaded engagement therein and interiorly threaded, athreaded lifting screw engaged therein and having independent spiralmove ment. therein during the adjustment of the parts in operation andmovable with the sleeve when the screw is not engaged with a stationaryobject, means for rotating the lifting sleeve to move the same upwardly.and means embodying an operating bevel gear rotating with said sleeveand through which said sleeve moves, said sleeve having a slotterminating near the bottom thereof to serve as a stop when the sleevehas rotated to a desired limit.

In-testimony whereof, I afiix my signature in the presenceof-two-witnesses.

JAMES M. WILLS.

Witnesses M.- MCMILLAN, R. SLONEMSKY.

